共 9 条
[1]
Blumenthal L.M., 1933, B AM MATH SOC, V39, P423
[2]
BLUMENTHAL LM, 1936, DUKE MATH J, V2, P396
[3]
HADAMARD J, 1931, LECONS GEOMETRIC ELE, V1
[4]
MENGER K, 1928, AKAD WISS WIEN AB MN, V65, P159
[6]
Schoenberg IJ., 1937, J LOND MATH SOC, V12, P48, DOI 10.1112/jlms/s1-12.45.48
[7]
Szego G., 1936, AM MATH MONTHLY, V43, P246
[8]
VONNEUMANN J, IN PRESS T AM MATH S